Adjustable hacksaw



March 16, 1965 A. L. JOHNSON 3,173,461

ADJUSTABLE HACKSAW Filed Aug. 3. 1962 "I-N V ENTOR ALVIN L.JOHNSON fwd-ATTORNEY United States Patent 3,173,461 ADJUSTABLE HACKSAW Alvin L.Johnson, 70 Piedmont St., Worcester, Mass. Filed Aug. 3, 1962, Ser. No.214,736 2 Claims. (Cl. 145-34) The instant application is acontinuation-impart of abandoned application Serial No. 74,317, filedDecember 7, 1960.

This invention relates to a new and improved adjustable hacksaw andrepresents an improvement on the invention disclosed in my Patent No.2,944,574, issued July 12, 1960.

The principal object of the present invention resides in the provisionof a hacksaw frame which is quickly and easily adjustable to takedifferent sizes of saws, say for instance, ten and twelve inch saws, bya very simple manipulation of the frame.

Another object of the invention resides in the provision of new andimproved means for locking the ends of the hacksaw blade in the frame,and to this end there is pro vided an novel mechanism which comprises acrossslotted member at each end of the frame for reception of thehacksaw blade at said ends, in combination with an annularly movablering-like member having an interruption therein for receiving the blade,and upon being turned, locks the blade into the slots.

A further object of the invention resides in the provision of theabove-described means for locking the blade in the frame at the ends ofthe blade, said means also providing for angularly adjusting the bladerelative to the frame and the handle portion thereof.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which FIG. 1 isa view in elevation illustrating the invention;

FIG. 2 is an enlarged section taken longitudinally through the adjustingmechanism for the frame;

FIG. 3 is a view in elevation, partly in section, on an enlarged scale,illustrating one of the blade-holding means;

FIG. 4 is a section taken along the line 44 of FIG. 3; and

FIG. 5 is a view in elevation, part in section, illustrating the otherblade-holding means.

Reference is made to my above-identified patent for some of the detailsof construction of the present hacksaw. However, the same comprises anykind of handle which may be desired and convenient such as is indicatedby the reference numeral 10. This handle is provided at its upper endwith an internal bore or the like 12 for the reception of a fixedtubular member 14 and at the inner end of the bore there is a cross-slotor the like 16 which loosely accommodates a relatively large thumb nut18.

The tube 14 is fixed in position and slidingly and telescopicallyreceives an interior tube 20. Tube 20 may be curved to a right-angularposition as at 22 to provide an end at 24 for holding a boss fordetachably securing the blade 26 with reference to a like but oppositelypositioned boss or member on the handle at 28. This will be hereinafterdescribed.

The tube 20 is provided with a longitudinal slot at 30 terminating in ashoulder 32. Tube 14 has provided thereon by any desired means such as aring 34, an interiorly extending pin 36 engaged in slot 30. This pinprevents tube 20 from rotating and from being withdrawn out ofassociation with tube 14 and to this end it is rovided with an interiorboss or stop 38, which together with shoulder 32, provides limitingmeans for the relative longitudinal adjustment of tube 20 within tube14.

3,173,461 Patented Mar. 16, 1965 At its inner end, tube 20 is providedwith a fixed nut 40, see FIG. 2, and in engagement with this nut thereis an interrupted screw 42 fast to the nut 18. When the nut 18 is turnedin the appropriate direction, it causes the blade to be tensioned andclamps the tube 20 with reference to the handle.

However, if it is desired to extend tube 20 to take a larger or longerblade 26, then the nut 18 is turned in the opposite direction until thenut 40 is disengaged from the portion 44 of the screw thread, and thenthe tube may be shifted to engage the portion 46 of the screw-threadwith nut 40. Thereupon tension is again applied to the blade 26 which ofcourse may be as much longer than the blade 26 shown in FIG. 1 as thedistance between the portions 44 and 46 of the interrupted screw.

Screw 42 has a blank 43 that is less in diameter than the screw threadsand when tension on the blade has been released the nut is ocmpletelyfree of the screw, either in the blank between threads 44 and 46 or atblank 43. Occasionally, in the absence of blank 43, the nut becomesstuck at the end of the thread 44 by being wedged, but

this cannot happen with blank 43 present.

At each end of the frame, i.e., at 24 and 28, there are providedremovable bosses which are disclosed in FIGS. 2, 3 and 5. These bossesare indicated as to the end of the frame at 24 by reference numeral 48and this boss comprises a separate, removable cylindrical member whichhas an annular indentation or groove 50 therein this groove receiving across pin 52 holding the boss 48 so it can rotate but cannot shiftaxially. The boss may be contained in a pair of opposite apertures inthe tubing forming the end 24. The member 48 being cylindrical, extendsto the right as shown in FIGS. 1 and 3 and terminates in a slit portion,the slit being indicated by the reference numeral 54, see FIG. 4. Thisslit 54 receives an end of the blade 26 and the split portion has atransverse through aperture therein as indicated at 56 through whichextends a ring 58 locking the blade in position.

Ring 58 has an opening 60 by which the blade is admitted into the slitin position shown in FIG. 3. By turning the ring and misaligning theopening 60 with the blade, the blade is held in position when the bladeis tightened by means of the thumb-piece 18 as above described.

The blade holder at the opposite end of the frame is substantially thesame except that the part at 28 has an opening therein which faces theapertures in the end 24 of the tube 20 and in this opening theme is acylindrical member 62 which is substantially the same as that of 48 butreversed. It has an annular groove 64 and it is held in position by apin 66 so that it can totate but it is not capable of axial motion. Itis also slit at 68 to receive the end of the blade 26 and the slitportions have holes 7 0 therein for the reception of a ring 72 similarto that at 58.

Once the blade is connected at its two ends as above described, it isonly necessary to turn the screw in the prop-er direction in order toimp-art the necessary degree of desired tension thereto, and this isdone in either adjustment of the tubular member 22 as will be clear.Thus the blade is held with the desired tension thereon whatever size ofblade is being used. Thus it is seen that the blade itself is angularlyadjustable to any position and that when positioned as desired, tensionis applied by the wheel 18 turning the screw 42 so that the blade isthen firmly held.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, otherwise than asset forth in the claims, but what I claim is:

1. A hack-saw comprising a handle, a tubular member in fixed relationthereto and extending therefrom, an

3 i elongated tubular member telescop-ingly associated with screw rodbeing longitudinally spaced along the axis the fixed tubular member andextending outwardly th reof the telescopic tubular member, and the nutbeing from and from the handle, means on the handle and selectivelyengageable with either screw-threaded the telescopic tubular member forengaging and holding portion on said screw rod and being relativelyfreely a hacksaw blade, andmeans adjustably securing the tele- 5slidable with respect to the rod between the screwscopic tubular memberto said handle and the fixed threaded portions. tubular member in any ofa plurality of selected longi- 2. The hacksaw recited in claim 1including, a blank tudinal positions with respect to the fixed tubularInemportion on the screw rod, said blank portion being elonber in orderto secure blades of different lengths in the gated sufiiciently tocompletely free the screw rod from hacksaW, 0 the nut at one extremityof relative motion of the nut said second means comprising a nut and acooperating relative to the screw.

interrupted screw rod having axially spaced threaded portionsselectively engageable in either portion References Cited by theExaminer thereof with said nut, with a blank portion between UNITEDSTATES PATENTS the threaded portions, said nut being fixed to the 5telescopic tubular member adjacent all 611d {here' gf 815 159 of islocated adjacent hand Sore, sl z IOd being engaged the nut and P gthrough 1 gf it, the nut and the screw-threaded portions of the 2116l375/38 g' 145 34 ig rz gdsl h vmg eerlrlheral matmg screw 20 2 597 403 552 Tedgsco 1 159 2,944,574 7/60 Johnson 145-34 a rotary actuator fixedto the screw rod and located in the handle for turning the screw rod,the latter W T I being substantially housed and concealed in the tele-ILLIAM FELDMAN P'lmmy Emmi scopic member, the screw-threaded portions onthe 25 MILTON MEHR,

1. A HACKSAW COMPRISING A HANDLE, A TUBULAR MEMBER IN FIXED RELATIONTHERETO AND EXTENDING THEREFROM, AN ELONGATED TUBULAR MEMBERTELESCOPINGLY ASSOCIATED WITH THE FIXED TUBULAR MEMBER AND EXTENDINGOUTWARDLY THEREFROM AND FROM THE HANDLE, MEANS ON THE HANDLE AND THETELESCOPIC TUBULAR MEMBER FOR ENGAGING AND HOLDING A HACKSAW BLADE, ANDMEANS ADJUSTABLY SECURING THE TELESCOPIC TUBULAR MEMBER TO SAID HANDLEAND THE FIXED TUBULAR MEMBER IN ANY OF A PLURALITY OF SELECTEDLONGITUDINAL POSITIONS WITH RESPECT TO THE FIXED TUBULAR MEMBER IN ORDERTO SECURE BLADES TO DIFFERENT LENGTHS IN THE HACKSAW, SAID SECOND MEANSCOMPRISING A NUT AND A COOPERATING INTERRUPTED SCREW ROD HAVING AXIALLYSPACED THREADED PORTIONS SELECTIVELY ENGAGEABLE IN EITHER PORTIONTHEREOF WITH SAID NUT, WITH A BLANK PORTION BETWEEN THE THREADEDPORTIONS, SAID NUT BEING FIXED TO THE TELESCOPIC TUBULAR MEMBER ADJACENTAN END THEREOF THAT IS LOCATED ADJACENT THE HANDLE, THE SCREW ROD BEINGENGAGED WITH THE NUT AND PASSING THROUGH IT, THE NUT AND THESCREW-THREADED PORTIONS OF THE SCREW ROD HAVING FULL, PERIPHERAL MATINGSCREW THREADS, A ROTARY ACTUATOR FIXED TO THE SCREW ROD AND LOCATED INTHE HANDLE FOR TURNING THE SCREW ROD, THE LATTER BEING SUBSTANTIALLYHOUSED AND CONCEALED IN THE TELESCOPIC MEMBER, THE SCREW-THREADEDPORTIONS ON THE SCREW ROD BEING LONGITUDINALLY SPACED ALONG THE AXIS OFTHE TELESCOPIC TUBULAR MEMBER, AND THE NUT BEING SELECTIVELY ENGAGEABLEWITH EITHER SCREW-THREADED PORTION ON SAID SCREW ROD AND BEINGRELATIVELY FREELY SLIDABLE WITH RESPECT TO THE ROD BETWEEN THESCREWTHREADED PORTIONS.